<template>
  <div class="login-container">
    <!--  el-form组件：elementUI插件里的一个组件，经常展示表单元素 model：用于收集表单数据 rules：表单验证规则  -->
    <el-form
      ref="loginForm"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      auto-complete="on"
      label-position="left"
    >
      <div class="title-container">
        <h3 class="title">登录</h3>
      </div>

      <el-form-item prop="teacherId">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="username"
          v-model="loginForm.teacherId"
          placeholder="教工号"
          name="username"
          type="text"
          tabindex="1"
          auto-complete="on"
        />
      </el-form-item>

      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="Password"
          name="password"
          tabindex="2"
          auto-complete="on"
          @keyup.enter.native="handleLogin"
        />
        <span class="show-pwd" @click="showPwd">
          <svg-icon
            :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'"
          />
        </span>
      </el-form-item>

      <el-button
        :loading="loading"
        type="primary"
        style="width: 100%; margin-bottom: 30px"
        @click.native.prevent="handleLogin"
      >登录
      </el-button>
    </el-form>
  </div>
</template>

<script>
import { validUsername } from '@/utils/validate'
import { RSAUtil } from '@/utils/RSAUtil'

export default {
  name: 'Login',
  data() {
    const validateId = (rule, value, callback) => {
      if (value.length === 0) {
        callback(new Error('教工号为空，请检查后重新输入教工号'))
      } else if (!validUsername(value)) {
        callback(new Error('教工号应为4-6位数字，请检查后重新输入教工号'))
      } else {
        callback()
      }
    }
    return {
      loginForm: {
        teacherId: '999999',
        password: '123456'
      },
      loginRules: {
        teacherId: [
          { required: true, trigger: 'blur', validator: validateId }
        ],
        password: [
          { required: true, trigger: 'blur', message: '请输入密码' }
        ]
      },
      loading: false,
      passwordType: 'password',
      redirect: undefined,
      pubUser: {
        teacherId: '',
        password: ''
      }
    }
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  methods: {
    showPwd() {
      if (this.passwordType === 'password') {
        this.passwordType = ''
      } else {
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    /* 登录业务：发请求，带着用户名和密码给服务器 */
    handleLogin() {
      /* 这里是在验证表单元素是否符合规则 */
      this.$refs.loginForm.validate(async(valid) => {
        /* 如果符合规则 */
        if (valid) {
          /* 按钮会有一个loading的效果 */
          this.loading = true
          // 发送PubKey请求
          await this.$store.dispatch('user/getPubKey', this.loginForm.teacherId).then((pub) => {
            // 接收到PubKey请求后，对密码进行加密
            this.pubUser.password = RSAUtil.publicKeyEncrypt(this.loginForm.password, pub)
            this.pubUser.teacherId = this.loginForm.teacherId
            this.loginForm.password = ''
          }).catch((e) => {
            this.loading = false
            console.log(e)
            return false
          })
          // 向服务器发送帐户名和密码进行登录
          await this.$store.dispatch('user/login', this.pubUser).then(() => {
            console.log('用户登录成功')
            /* 登录成功进行路由的跳转 */
          }).catch((e) => {
            this.loading = false
            console.log(e)
            return false
          }
          )
          await this.$store.dispatch('session/getSession').then(() => {
            console.log('getSession Ok')
            this.loading = false
            this.$router.push({ path: this.redirect || '/' })
          }).catch((e) => {
            this.loading = false
            console.log(e, 'getSession Error')
          })
        } else {
          return false
        }
      })
    }
  }
}
</script>

<style lang="scss">
/* 修复input 背景不协调 和光标变色 */
/* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

$bg: #283443;
$light_gray: #fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: $cursor;
  }
}

/* reset element-ui css */
.login-container {
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
  }
}
</style>

<style lang="scss" scoped>
$bg: #2d3a4b;
$dark_gray: #889aa4;
$light_gray: #eee;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }

  .tips {
    font-size: 14px;
    color: #fff;
    margin-bottom: 10px;

    span {
      &:first-of-type {
        margin-right: 16px;
      }
    }
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }
}
</style>
